Get and post differences in PHP

There are two ways to establish a connection on the client and server side.
One is get mode
The other is the Post method
So what's the difference between the two?

1. Show a Difference
   The Get method is to stitch strings in the address bar to see
   And the Post method is invisible.

2. The size of the pass is different
   The specific size and browser are related, ie browser is 2k other browser maximum value may be different, but also relatively small.
   The Post method passes the size of the parameter can be set, the original is considered infinitely large. In PHP, the php.ini file can be set to the size of the parameter.

3. Security
   The Get method is less secure because the Post method is relatively safe to expose

4. Principle of submission
   The data submitted by the Get method is independent.
   The Post method turns all committed data into a single whole (commits the data into XML format)

5. Flexibility
   The Get method is flexible,
   Post method is not flexible, must have a form of participation in order to use post submission is inconvenient

post and get is not a claim, a commit. Both can be submitted and obtained. It's just that they're different from the server-side mechanism for requesting data